Cleaning of ventilation ducts in ventilation systems

The following is stated in the user manual:

If you don't damage them, then nothing will leak. The plastic slats are ultrasonic welded, nothing penetrates there, and actually, a heat exchanger as shown in the picture should be completely wrapped with sealant. That's where you separate the wheat from the chaff.



Regarding your problem with drawing in the chimney air etc. That is normal. You also pull air from neighboring chimneys. But still only a fraction of what an open window brings of polluted air into the house.

The plastic lamellae are ultrasonic welded, nothing can get through, and actually a heat exchanger as shown in the picture should be completely wrapped all around with sealant.

This is how it looks for me

Yes, I already saw it in the first pictures. The system is put together quite strangely. The bent filter also looks adventurous.

In mine, not even a sheet of paper fits there, so nothing can leak or anything like that.

Yes, I already saw it on the first pictures. The system is put together quite strangely. The bent filter also looks adventurous.

On mine, not even a sheet of paper fits in there, so nothing can leak through, etc.

Well, I relied on my builder. Actually, the system is from Vallox.

I would like to summarize some points of our discussion.

Research question:

How important is the hygienic condition of the exhaust air duct for supply air quality. It is usually assumed that a negative pressure is generated in the exhaust air duct and no air comes from the duct into the house. However, the discussion considers other aspects that are not so obvious.

The following reasons for influencing the supply air quality were discussed:

- Leakage in the system construction.

- Leakage in the heat exchanger.

- Suction of exhaust air into the supply air duct.

Leakage in the system construction:

Must be checked during maintenance. Can be caused by poorly fitted sealing elements (at least in my system).

Leakage in the heat exchanger

Modern manufacturing processes make it possible to avoid leaks in the heat exchanger. During maintenance, special care must be taken not to damage the sensitive fin structure.

Suction of exhaust air into the supply air duct:

Here we agreed that the exhaust air can be sucked into the supply air duct.

Regarding your problem with the suction of the chimney air etc. That is normal.

Conclusion.

To guarantee the hygienic condition of the supply air, the exhaust air duct must also be clean.